Assia.ch is a Swiss tuning and motorsport shop offering performance and styling products for a wide range of vehicle makes. Its catalogue spans more than 17,000 items, including alloy wheels, tyres, suspension and braking components, exhaust systems, engine-performance parts, vehicle-interior accessories and aerodynamic upgrades. Customers can browse products by vehicle make or choose from an extensive selection of specialist manufacturers.

The shop stocks wheels from brands such as BBS, OZ Racing, Rotiform and Vossen, alongside suspension products from KW, ST Suspensions, Eibach and Bilstein. Its exhaust range includes systems and components from Akrapovic, Remus, Milltek, Grail and other manufacturers, as well as downpipes and sport catalytic converters. Engine-related offerings include intercoolers, sport clutches and other performance equipment. Assia.ch also lists FIA motorsport products and documentation, including Swiss certificates and approvals for selected parts, such as wheels, exhausts and spacers.

The store highlights competitive pricing, reports more than 10,000 satisfied customers and displays a 4.3-star rating. Its broad selection serves drivers seeking functional upgrades or distinctive vehicle styling.